How to pass an std::string to glShaderSource?

Question

I have the following code:

glShaderSource(shader, 1, (const char **)data.c_str(), NULL); 

But it makes my program crash. How do I convert std::string into const char ** ? I also tried (const char **)& but it said "requires l-value" which I don't understand. It works fine when I use this code:

const char *data = "some code"; glShaderSource(shader, 1, &data, NULL); 

But I can't make it work directly from a std::string. I could allocate a new char array for it but that is not nice code.

I also tried with const GLchar but obviously it makes no difference.

Answer 1

data.c_str() returns a const char*, so do this:

const char *c_str = data.c_str(); glShaderSource(shader, 1, &c_str, NULL);